站内源荷集中接入直流母线的极间短路故障线路识别方法

Identification method of inter pole short circuit fault line with centralized generators and loads connected to DC bus in same station

针对站内源荷短线路集中接入直流母线的情况,分析各线路故障下直流电流的特征,基于此提出基于符号秩检验电流的方向和基于欧氏距离检验电流变化程度的方法。以典型场景为例,对不同线路故障下各线路电流进行仿真分析,对所提方法进行验证,结果表明所提方法能够快速准确地识别故障线路。最后,分析了3种直流电流互感器采集数据异常的影响,结果表明互感器数据异常不影响所提方法进行正确判断。

Aiming at the situation that,in the same substation,the generators and loads centrally connected to the DC bus with short lines,the characteristics of DC current under fault of each line are analyzed.On this basis,the methods of checking current direction based on symbolic rank and checking current change degree based on Euclidean distance are proposed.Taking the typical scene as an example,the current of each line under different line faults is simulated and analyzed,and the proposed method is verified.The verification results show that the proposed method can identify the fault line quickly and accurately.Finally,the influence of three kinds of abnormal data of DC current transformers is analyzed,and the results show that the abnormal data of DC current transformers does not affect the correct judgment of the proposed method.